Analysis of the impact of the Asset Health Index in a Maintenance Strategy

Hosted by the Johannes Kepler University, Linz, Austria. May 23-24, 2019 - European Safety, Reliability & Data Association (ESReDA)During many years, asset management methodologies used in industry were focused on knowing and analysing the operational control of the daily work and the impact of the maintenance on the availability. Later, the costs turn into the priority, and strategies were focused on assesses a longer lifecycle and optimizing processes and contracts. Finally, recent normative have included concepts as “knowing and managing the risks” and the target is to prioritize the maintenance tasks to the critical assets. However, taking a balanced asset management model for the operational environment, quite a lot of facilities of Oil & Gas sector are reaching the end of their initially estimated lifecycle. New challenges are related to extend the life of the main items of the facilities or at least, to find the optimal replacement moment that guarantees that the maintenance strategy is being optimized. Asset Health Index methodology considers a theoretical lifecycle of an item, in which depending on the proximity to the end of the useful life, the probability of failure increases. But take this theoretical lifecycle as a base, different operation location factors or O&M aspects can modify this period. All these factor are quantified and permit us to calculate a new theoretical profile. This paper is about assess the impact of the AHI into the maintenance strategy optimisation. AHI enables us to compare future alternative cost profiles and assess the impact in the failure probability of the item. As a result, we are able to know the risk that is taken when we enlarge the operation of an item, and the impact in the operational costs

Criticality Analysis for Maintenance Purposes: A Study for Complex In‐service Engineering Assets

The purpose of this paper is to establish a basis for a criticality analysis, considered here as a prerequisite, a first required step to review the current maintenance programs, of complex in‐service engineering assets. Review is understood as a reality check, a testing of whether the current maintenance activities are well aligned to actual business objectives and needs. This paper describes an efficient and rational working process and a model resulting in a hierarchy of assets, based on risk analysis and cost–benefit principles, which will be ranked according to their importance for the business to meet specific goals. Starting from a multicriteria analysis, the proposed model converts relevant criteria impacting equipment criticality into a single score presenting the criticality level. Although detailed implementation of techniques like Root Cause Failure Analysis and Reliability Centered Maintenance will be recommended for further optimization of the maintenance activities, the reasons why criticality analysis deserves the attention of engineers and maintenance and reliability managers are precisely explained here. A case study is presented to help the reader understand the process and to operationalize the mode

Robustness and capabilities of ultrashort laser pulses characterization with amplitude swing

[EN]In this work we firstly study the influence of different parameters in the temporal characterization of ultrashort laser pulses with the recently developedamplitude swing technique. In this technique, the relative amplitude of two delayed replicas is varied while measuring their second-harmonic spectra. Herewe study the retrieval of noisy traces and the implications of having different delays or phase retardations (relative phases)between the two replicas. Then, we study the capability of the technique to characterize the pulses when the second-harmonic signal is spectrally uncalibrated or incomplete, presenting the analytical calculation of the marginal, which is used to calibrate the traces and to perform the pulse retrievals. We experimentally show the retrieval of different pulses using diverse delays and phase retardationsto perform the amplitude swing trace and demonstrate that, from an uncalibrated trace, both the pulse informationandthe response of the nonlinear process can be simultaneously retrieved.In sum, the amplitude swing technique is shown to be very robust against experimental constraints and limitations, showing a high degree of soundness.Spanish Ministerio de Economía y Competitividad (MINECO) (FIS2017-87970-R, EQC2018-004117-P), Consejería de Educación, Junta de Castilla y León (SA287P18) and FEDER Funds, Fundación General de la Universidad de Salamanca (PC_TCUE18-20_020)

Estudio del negocio y situación actual de las telecomunicaciones en Argentina: caso Telefónica en el mercado digital

La investigación se enfoca en estudiar si Telefónica de Argentina se encuentra en una situación acorde a la necesaria para liderar la industria, como lo ha logrado y como actúa su competencia al respecto. Para ello se realizó un análisis detallado sobre la evolución de la industria de las telecomunicaciones, se analizó el mercado de las TIC (Tecnologías de la información y la comunicación) en Argentina, se observó el comportamiento de las personas con relación al mercado digital, e internet, y cuáles son los diferentes usos que le da la gente a las nuevas tecnologías

Acciones y logros en la autorregulación del aprendizaje en entornos personales. Un estudio en el Grado de Educación Infantil en la Universidad de Granada

This paper is intended to study the self-regulated learning (SRL) process in personal learning environments (PLEs) among students participating in the Graduate Program for Preschool Education at the University of Granada (Spain). The study is focused on self-regulatory actions carried out by students, and on their self-regulated learning achievements, during the phases of action and reflection of this process. A Likert scale questionnaire was applied to a random cluster sample of the population. Descriptive and inferential statistical analyses were performed based on the collected data, as were non-parametric correlation and analysis of variance tests. The results confirm the importance of individual learning in the self-regulated process, and highlight the importance of digital tools in all three phases of self-regulation. Furthermore, the results show that teachers’ suggestions are related to the use of digital tools and recording of reflections on the learning process, and establish relationships between learning management tools and cognitive and metacognitive processes. The results also permit classification of students into three subgroups, based on their achievements. Analyses are consistent with the theory that explains the cyclical nature of self-regulated learning and the influence of social relationships on individual self-regulatory processes.Este artículo estudia el proceso de autorregulación del aprendizaje en entornos personales de aprendizaje de los estudiantes del Grado en Educación Infantil de la Universidad de Granada (España). El estudio se enfoca en las acciones autorreguladoras realizadas por los estudiantes y en los logros de autorregulación del aprendizaje alcanzados durante las fases de actuación y de reflexión de este proceso. Se aplicó un cuestionario tipo escala Likert en una muestra aleatoria por conglomerados de la población. Sobre los datos recabados se efectuaron análisis de estadística descriptiva e inferencial así como pruebas no paramétricas de correlación y de varianzas. Los resultados confirman la importancia del sujeto aprendiente en el proceso de autorregulación y resaltan la importancia de las herramientas digitales en las tres fases de la autorregulación. Asimismo, los hallazgos muestran que las sugerencias del profesor están relacionadas con el uso de las herramientas digitales y con el registro de las reflexiones sobre el propio aprendizaje, relacionan las herramientas universitarias de gestión del aprendizaje con procesos cognitivos y metacognitivos. Los análisis son consistentes con la teoría que explica la naturaleza cíclica de la autorregulación del aprendizaje y la influencia de las relaciones sociales sobre los procesos autorregulatorios individuales